Check for system leakage, inadequate compressor size for vehicle application, air-dryer purge valve stuck open, or a defective unloader mechanism and/or governor. * Will not unload – a compressor that ...

• Check the air dryer for proper operation, changing the desiccant cartridge and purge valve as necessary. • Thaw out frozen air lines and valves by placing the vehicle in a warmed building. This is ...

tank. As warm, moist air from the compressor hits the cool outer walls of the dryer, some moisture will condense on the walls and drain down into the purge-valve area. The air is then forced through a ...

This air dryer purge valve has been ... is a great time to check for leaks around brake valves where O-rings might have been exposed to these chemicals or replace valves that may be sticking ...

The air is then exhausted through the discharge reed valve to build system air pressure. In the “unloaded” mode, the ESS piston is up, opening the cylinder to the compressor inlet.